Topic 1 Question 670
A company performs tests on an application that uses an Amazon DynamoDB table. The tests run for 4 hours once a week. The company knows how many read and write operations the application performs to the table each second during the tests. The company does not currently use DynamoDB for any other use case. A solutions architect needs to optimize the costs for the table.
Which solution will meet these requirements?
Choose on-demand mode. Update the read and write capacity units appropriately.
Choose provisioned mode. Update the read and write capacity units appropriately.
Purchase DynamoDB reserved capacity for a 1-year term.
Purchase DynamoDB reserved capacity for a 3-year term.
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- 正解だと思う選択肢: A
On-demand mode Option A: On-demand mode is suitable for workloads that are unpredictable or that do not have significant or consistent database traffic. It automatically scales to accommodate workload demands and charges for the read and write throughput that the application consumes. For infrequent testing, this could be cost-effective because you only pay for what you use during the testing period and don't incur costs when the table is not being accessed.
Whereas for the Option B, if you only run tests once a week for 4 hours, you might pay for unused capacity for the rest of the week unless you manually scale down the capacity after tests are completed, which adds operational overhead.
👍 3OSHOAIB2024/01/07 - 正解だと思う選択肢: B
Provisioned Mode (Option B): Provisioned mode allows you to specify the desired read and write capacity units. Since the workload occurs once a week for 4 hours, you can provision the read and write capacity units accordingly to handle the expected load during that time. This can be a more cost-effective option than on-demand pricing for predictable workloads.
👍 1meenkaza2023/12/29 - 正解だと思う選択肢: B
Agree with B, on-demand mode might not scale fast enough after the DB has been idle for 164 hours. As they know exactly the number of reads and writes per second, should use provisioned mode, and set capacity to 1 RCU and 1 WCU while the DB is not in use.
👍 1pentium752024/01/03
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